Steam boiler



M. l. KEARNS STEAM BOILER Dec. 19, 1933.

Filed Nov. 13, 1930 2 Sheets-Sheet 1 lNV ENTOR ATTORN El? I. KEARNS Dec.19, 1933.

STEAM BOILER Filed Nov. 13, 1930 2 Sheets-Sheet 2 00000000 OOOOOOOHHUonoodoon oboonooW 0.0000000 OOQQQoQ H IK 0000000 FIG 3.

INVENTOR M; f 11M BY Wade/KM 9 ATTORNEYS Patented Dec. 19, 19331,940,132 STEAM BOILER 'Michael' I. Kearns, Allentown, Pa., assignor toFuller Lehigh Company, Fullerton, Pa., a corporation of DelawareApplication November 13, 1930 Serial'No.'495,319.

I 9'Claims (Cl. 122-235) This invention relates to a steam boiler of theStirling type in which a row of inclined tubes is providedin front-ofthe front bankof. boiler tubes to serve as aslag screen. for the boilerIi tubes. These tubes extend into a header located at the upper rearportion of the boiler furnace with the lower portions ofv these tubeslined with tile to serve as a portion of the roof of the furnace and toserve to protect the mud drum of the boiler from the hot gasesfrom thefurnace.

. The invention will be understood from the description in connectionwith the accompanying drawings, in which Fig. l is a vertical, sectionthrough an illustrative embodiment of the inll vention; Fig. 2 is asimilar section, partly broken away, showing a modification; Fig. 3'is asection along the line 3-+3 of Fig. 1; and Figs. '4 and 5 are sectionson a larger scale showing some of the details.

.20 In the drawings, reference character 1 indicates a furnace abovewhich a Stirling boiler is located having upper drums 2 and a lower ormud drum 3 connected by banks of tubes 4 in the well-known manner.

The furnace 1 may be fired by means of a stoker 5 and an ashpit 6 may belocated at the rear end of the stoker.

The front wall of the furnace is shown as extending straight downwardlyfrom the front upper drum 2 and this wall is provided with a row oftubes 7 extending from a horizontally disposed header 8 spring supportedby means of the supports 9 into the front drum 2.

The header 8 may be connected to the water space of the boiler by meansof one or more pipes 10.

The rear wall of the furnace is provided with a row of upwardlyextending tubes 11, the lower and upper ends of which extend outwardlyinto a lower header 12 and an upper header 13, respectively. The lowerheader 12 may be connected to the mud drum 3 by one or more pipes 14 andthe upper header 13 may be connected to the steam space of the boiler bymeans of the pipe 15. Recirculating tubes 16 located outside of thefurnace may connect the headers 12 and 13 for local circulation ofwater. 1

A horizontally disposed header 17 is located outside of the rear upperportion of the furnace 1 and a row of tubes 18 extends in an upwardlyinclined direction from this header along the upper rear portion of thefurnace and thence upwardly in front of the front bank 4 of boiler tubesto the front drum 2. Alternate tubes 18 have portions 19' in front ofthe tube bank 4 bent. forcircuitingof hot gases beneath this drum, and

downward direction, and the header 17 may be connected to the waterspace of theboiler by one or more pipes 22. A baffle 23 extends from theupper portion of the tile 20 that form a furnace arch, to the drum 3 toprevent shorta link mechanism 23' below the baiile23 connects the tubes18 to the drum 3' to support the intermediate portions of these tubesand still permit expansion so that the arch is flexibly supported by theboiler.

The side walls of the furnace maybe provided with upwardly extendingwater wall tubes 24 connected to upper and lower headers 25 and 26 andthese tubes, as well as the; tubes 11, may be lined with tile or thewell-known Bailey blocks 27. The headers 25 and 26 are connected to thewater circulation system of the boiler in the wellknown manner. A gasseal 28 is provided between the lower portions of the tubes 18 that arelined with tile 20 and the upper end of the rear wall of the furnacethat is made up of the tubes 11 and blocks 27.

In the modification shown in Fig. 2, an upper horizontally disposedheader 30 is located outside of the boiler setting a short distance fromthe front drum 2 and is supported upon a support 31. This header 30 maybe connected to the steam space of the boiler by means of the pipe 32,the remainder of this modification being quite similar to that alreadydescribed. 9

By this invention, a vertical front wall can be used from the frontupper drum of'the boiler so that a furnace can be made of greater depththan ordinary, thus making a more compact setting than is the case whenthe front wall extends forwardly from the front drum of the boiler. Alsothe mud drum of the boiler is protected from the heat of the furnace andhot gases from the furnace are not permitted to impinge directly uponthis drum. The tubes l8'not only provide a slag screen for protectingthe boiler tubes, but

these tubes provide additional evaporating surface i'or generating steamfor the boiler.

I claim:

1. In a boiler having an upper drum, a lower no mud drum, and a bank ofbent tubes connecting said drums, a furnace, a horizontally disposedspring supported header located outside of the upper rear portion ofsaid furnace, a row of upwardly and forwardly inclined tubes extendingfrom said header to the front drum of said boiler, and means to supportan intermediate portion of said tubes from said mud drum.

2. In a boiler having an upper drum, a lower mud drum, and a bank ofbent tubes connecting said drums, a furnace, a horizontally disposedheader located outside of the upper rear portion of said furnace, a rowof upwardly and forwardly inclined tubes extending from said header tothe front drum of said boiler, a gas seal extending from said row oftubes to the mud drum of said boiler, and suspension members connectedfrom said mud drum to said tubes.

3. In a boiler having an upper drum, a lower mud drum, and a bank ofbent tubes connecting said drums, a furnace, a lower header at the rearof said furnace, an upper header at the front of said furnace, a row oftubes connecting said headers and extending substantially parallel tothe front bank of tubes of said boiler, a gas seal from said row oftubes to the mud drum of said boiler, and a support for an intermediatepart of said tubes behind said gas seal.

4. In a boiler having an upper drum, a lower mud drum, and a bank ofbent tubes connecting said drums, a furnace, a row of inclined tubesextending across said furnace, the upper portions of said tubes beingstaggered and the lower portions being lined with tile to form a wall,and a baffle extending from the upper edge of said wall to said muddrum.

5. Ina boiler having an upper drum, a lower mud drum, and a bank of benttubes connecting said drums, a furnace, a row of tubes extending acrossthe upper portion of said furnace, a portion of said tubes beingprovided with refractory material to form a furnace arch, and a supportextending from the mud drum of said boiler to said tubes and connectedto said mud drum and tubes.

6. In a boiler having an upper drum, a lower mud drum, and a bank ofbent tubes connecting said drums, a furnace, a row of tubes extendingacross the upper portion of said furnace, a portion of said tubes beingprovided with refractory material to form a furnace arch, and. aflexible support between the mud drum of said boiler and said tubes andconnected to said mud drum and tubes. I

'1. In a boiler having an upper drum, a lower mud drum, and a bank ofbent tubes connecting said drums, a furnace, a row of tubes extendingacross the upper portion of said furnace a portion of said tubes beingprovided with refractory material to form a furnace arch, a supportextending from the mud drum of said boiler to said tubes and connectedto said mud drum and tubes, and a gas seal between said drum and arch.

8. Ina boiler having an upper drum, a lower mud drum, and a bank ofinclined tubes connecting said drums, a furnace, a row of tubes havingtheir upper portions extending across the upper portion of said furnacein front of said tube bank and arranged to form a slag screen therefor,the lower poriions of said row of tubes being provided with refractorymaterial to form a furnace arch, and a support extending from the muddrum of said boiler to said row of tubes and connected to said mud drumand tubes.

9. In a boiler having an upper drum, a lower mud drum, and a bank ofinclined tubes connecting said drums, a furnace, a row of tubes havingtheir upper portions extending across the upper portion of said furnacein front of said tube bank and arranged to form a slag screen therefor,the lower portions of said row of tubes being provided with refractorymaterial to form a furnace arch, and a pivoted link support extendingfrom the mud drum of said boiler to an intermediate portion of said rowof tubes and connected to said mud drum and tubes.

MICHAEL I. KEARNS

